Harvard Bioscience Inc (HBIO) · Insider trading
What Harvard Bioscience's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$202,354
4 insiders, 5 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
+$202,354
bought less sold
Latest filing
2026-06-12
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Snider WilliamDirector | $103,604 | – | 2 | 2026-03-17 | 32,000 |
| Denelsky Stephen JDirector | $48,700 | – | 1 | 2026-03-17 | 21,000 |
| Duke John DDirector, Chief Executive Officer | $25,050 | – | 1 | 2026-03-16 | 105,000 |
| Frost Mark TChief Financial Officer | $25,000 | – | 1 | 2026-03-16 | 17,500 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-03-17 | Snider WilliamDirector | Buy | 8,475 | 4.85 | $41,104 | 32,000 | Form 4 |
| 2026-03-17 | Denelsky Stephen JDirector | Buy | 10,000 | 4.87 | $48,700 | 21,000 | Form 4 |
| 2026-03-16 | Frost Mark TChief Financial Officer | Buy | 5,000 | 5.00 | $25,000 | 17,500 | Form 4 |
| 2026-03-16 | Snider WilliamDirector | Buy | 12,525 | 4.99 | $62,500 | 23,525 | Form 4 |
| 2026-03-16 | Duke John DDirector, Chief Executive Officer | Buy | 5,000 | 5.01 | $25,050 | 105,000 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
15 × grant or award8 × shares withheld for tax5 × returned to the company
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-06-09 | Eade Katherine A.Director | Grant or award A | +16,556 | – | 58,669 | Form 4 |
| 2026-06-09 | Benson Seth BenjaminDirector | Grant or award A | +16,556 | – | 27,556 | Form 4 |
| 2026-06-09 | Gagnon Robert E.Director | Grant or award A | +16,556 | – | 27,556 | Form 4 |
| 2026-06-09 | Denelsky Stephen JDirector | Grant or award A | +16,556 | – | 37,556 | Form 4 |
| 2026-06-09 | Snider WilliamDirector | Grant or award A | +16,556 | – | 48,556 | Form 4 |
| 2026-03-20 | Frost Mark TChief Financial Officer | Grant or award A | +30,000 | – | 47,500 | Form 4 |
| 2026-03-20 | Duke John DDirector, Chief Executive Officer | Grant or award A | +75,000 | – | 180,000 | Form 4 |
| 2025-12-17 | Snider WilliamDirector | Grant or award A | +110,000 | – | 110,000 | Form 4 |
| 2025-09-05 | Denelsky Stephen JDirector | Grant or award A | +110,000 | – | 110,000 | Form 4 |
| 2025-08-15 | Green James WDirector | Returned to the company D | −49,048 | – | 2,796,040 | Form 4 |
| 2025-08-15 | Green James WDirector | Shares withheld for tax F | −33,200 | 0.53 | 2,762,840 | Form 4 |
| 2025-08-15 | Green James WDirector | Returned to the company D | −119,332 | – | 2,643,508 | Form 4 |
| 2025-08-15 | Green James WDirector | Shares withheld for tax F | −11,540 | 0.53 | 2,631,968 | Form 4 |
| 2025-08-15 | Green James WDirector | Returned to the company D | −66,036 | – | 2,565,905 | Form 4 |
| 2025-08-15 | Green James WDirector | Returned to the company D | −113,366 | – | 2,452,566 | Form 4 |
| 2025-08-08 | Duke John DDirector, Chief Executive Officer | Grant or award A | +500,000 | – | 500,000 | Form 4 |
| 2025-08-08 | Duke John DDirector, Chief Executive Officer | Grant or award A | +500,000 | – | 1,000,000 | Form 4 |
| 2025-07-16 | Benson Seth BenjaminDirector | Grant or award A | +110,000 | – | 110,000 | Form 4 |
| 2025-07-16 | Gagnon Robert E.Director | Grant or award A | +110,000 | – | 110,000 | Form 4 |
| 2025-07-16 | Eade Katherine A.Director | Grant or award A | +110,000 | – | 421,126 | Form 4 |
| 2025-05-12 | Frost Mark TInterim CFO | Grant or award A | +100,000 | – | 125,000 | Form 4 |
| 2025-03-19 | Green James WDirector, Chief Executive Officer | Shares withheld for tax F | −38,413 | 0.69 | 2,845,088 | Form 4 |
| 2025-03-19 | Cote JenniferChief Financial Officer | Shares withheld for tax F | −5,687 | 0.69 | 159,019 | Form 4 |
| 2024-12-31 | Green James WDirector, Chief Executive Officer | Returned to the company D | −145,365 | – | 2,883,501 | Form 4 |
| 2024-12-29 | Cote JenniferChief Financial Officer | Shares withheld for tax F | −4,731 | 1.98 | 164,007 | Form 4 |
| 2024-12-29 | Cote JenniferChief Financial Officer | Shares withheld for tax F | −3,797 | 1.98 | 160,210 | Form 4 |
| 2024-12-29 | Green James WDirector, Chief Executive Officer | Shares withheld for tax F | −56,915 | 1.98 | 3,054,176 | Form 4 |
| 2024-12-29 | Green James WDirector, Chief Executive Officer | Shares withheld for tax F | −25,310 | 1.98 | 3,028,866 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.